Order Number: EK–SMCPC–UG. A01
Glossary–1
Glossary
This Glossary provides definitions of commonly used terms in the Wide Expansion Storage Pedestal
User's Guide.
ac distribution
The method of routing ac power in the pedestal.
Battery Backup Unit (BBU)
StorageWorks power unit option that extends power availability after the loss of primary ac
power or a power unit, to protect against the corruption or loss of data.
cold swap
A method of device replacement that requires that power be removed from the pedestal, thereby
affecting other devices therein. User applications that are dependent on the devices being
swapped are impacted as a result. This method is used when conditions preclude the use of a hot-
swap method. Normally, this method is only used when installing or upgrading a StorageWorks
subsystem.
disk
A storage device supporting random access to fixed sized blocks of data.
host
The primary or controlling computer (or any such computer in a multiple computer network) to
which storage is attached.
hot swap
A method of device replacement whereby the complete system remains on-line during device
removal or insertion. Activity may be suspended for a brief period during device insertion or
removal.
SBB
StorageWorks building block. The basic building block of the StorageWorks product line. Any
device conforming to pedestal mechanical and electrical standards, installed in either a 3.5-inch
or 5.25-inch carrier, is considered an SBB, whether it is a storage device, power supply, CPU, or
other device.
